Jul 10 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Applications
Introduction
Nickel alloy 800H/HT is intended for high temperature structural applications. The high nickel content in its composition makes the alloys highly resistant to both carborisation and to embrittlement from precipitation of sigma phase.
The following section will discuss in detail about nickel alloy 800H/HT.
Chemical Composition
The chemical composition nickel alloy 800H/HT is outlined in the following table.
|
Element |
Content (%) |
|
Iron, Fe |
39.5 |
|
Nickel, Ni |
30-35 |
|
Chromium, Cr |
19-23 |
|
Manganese, Mn |
1.5 |
|
Silicon, Si |
1 |
|
Copper, Cu |
0.75 |
|
Titanium, Ti |
0.25-0.6 |
|
Aluminum, Al |
0.25-0.6 |
|
Carbon, C |
0.06-0.1 |
|
Sulfur, S |
0.015 |
Physical Properties
The following table shows the physical properties of nickel alloy 800H/HT.
|
Properties |
Metric |
Imperial |
|
Density |
7.94 g/cm3 |
0.29 lb/in3 |
Mechanical Properties
The mechanical properties of nickel alloy 800H/HT are displayed in the following table.
|
Properties |
Metric |
Imperial |
|
Tensile strength |
448 MPa |
65 ksi |
|
Yield strength |
172 MPa |
25 ksi |
|
Elongation at break |
20% |
20% |
Thermal Properties
The thermal properties of nickel alloy 800H/HT are given in the following table
|
Properties |
Metric |
Imperial |
|
Thermal expansion co-efficient (@20-100°C/68-212°F) |
14.4 µm/m°C |
8 µin/in°F |
|
Thermal conductivity |
11.5 W/mK |
79.735 BTU.in/hrft².°F |
Applications
The following are the list of applications of nickel alloy 800H/HT:
-
Ethylene furnace quench boilers
-
Super-heater and re-heaters in power plants
-
Industrial furnaces
-
Chemical and petrochemical processing
-
Hydrocarbon cracking
-
Pressure vessels